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Tia777
Adaptive radiation is an evolutionary activity which creates several new species out of a single specie. Darwin embraces this philosophy that the finches evolve from an ancestral finch by adapting to the different environment.

Answer: Adaptive radiation

Explanation:  Darwin's Finches are the best example of adaptive radiation. The Darwin's finches were originally not the fiches but these endemic species adapted specialized feeding behavior.

They were derived from a single ancestor that arrived to the island from South America. These birds had beaks of different sizes and shapes for the eating food.